Stoneworking machine



Feb. 11, 1930. s, LEGGE 1,746,662

STONEWORKING MACHINE Filed Aug. 2, 1927 4 Sheets-Sheet l m I nvewaior: Peter J-L996 4 JW 0 l Feb. 11, 1930. P. s. LEGGE STONEWORKING MACHINE Filed Aug. 2, 1927 4 Sheets-Sheet 2 I nus-2230:".- Peifer J.Le,gge

by V %2396 Feb. 11, 1930. P. s. LEGGE STONEWORKING MACHINE 4 Shets-Sheet 4 Filed Aug. 2, 1927 eggs I inveraio r.-

g Pei e aL Patented Feb. 11, 1930 PETER S. LEGGE, OF POMIPTON LAKES, NEW JERSEY STONEWORKING MACHINE Application filed August 2, 1927. Serial No. 210,071.

My invention relates to sawing machines, and particularly but not exclusively to one of the rcciprocatory saw type for sawing stone such as granite.

The invention will be best understood from the following description when read in the light of the accompanying drawings of a specific embodiment of the invention selected for illustrative purposes, while the scope of the invention will be more particularly pointed out in the appended claims.

In the drawings Fig. 1 is a side elevation of a machine constructed according to the invention, with parts omitted and parts broken away;

Fig. 2 is an end elevation of the machine according to Fig. 1, and a schematic wiring diagram of the electrical instrumentalities of the machine;

Fig. 3 is a section on the line 33 of Fig. 1, with parts omitted;

Fig. 4 is a section on the Fig. 3;

Fig. 5 is a section on the line 55 of Fig.

line 44 of 1, with parts omitted;

Figs. 6 and 7 respectively are sections on the lines 66 and 77 of Fig. 3;

Figs. 8 and 9 respectively are sections on the lines 88 and 99 of Fig. 7; and

Fig. 10 shows a detail.

Referring to the drawings the machine illustrated comprises the six vertical columns 1 on which are slidably mounted sleeves 3, the latter having project-ion's 5 provided with screw threaded perforations through which extend vertical screws 7. Herein the six screws are each rotatably mounted at 9 and 11 in bearings formed in brackets at the bottom and top of the respective posts. As shown each screw at its upper end is provided with a bevel gear 13 meshing with a cooperating bevel gear 15 on a lay shaft 17, the several lay shafts as clearly illustrated by the drawings extending longitudinally and transversely of the machine so as to connect all the screws for simultaneous rotation.

As illustrated. the sleeves 3 on the right hand pair of posts in Fig. 3 and on the middle pair of posts carry guide bars 19, the adjacent ends of the guide bars at the rear of the machine, as viewed in Fig. 3, being connected by an angle-iron 21, while the sleeves 3 on the left hand pair of posts, as viewed in Fig.

3, are connected to the sleeves at the same side of the machine on the middle pair of posts by channel-irons 23, the sleeves on opposite posts being connected by channel-irons 25, this construction forming a support which will be raised or lowered when the screws 7 are rotated in the appropriate div rection.

On the ways 27 of the guide bars 19 are slidably mounted shoes 29, each shoe being provided with a bracket portion 31, the two opposite bracket portions being connected to a saw frame, which frame comprises the two L-shaped castings 33 connected by a pair of channel-irons 35.

As shown the L-shaped castings 33 at the ends of the legs thereof toward the front of the machine have journalled therein spindles 37 which carry heads 39 of known construction to which opposite ends of a reciprocatory type saw are secured, this saw as herein illustrated (Figs. 1, 3 and 10) comprising a blade 43 to which are secured spaced saw teeth 45, the width of which teeth is materially greater than that of said blade. In operation water and steel shot, or other suitable abrasive, may

be fed tothe saw slot to facilitate the sawing operation. I have found that more effective results will be secured with steel shot or abrasive of like characteristics if the saw is given a vibratory motion, preferably one of high frequency and low amplitude, and herein for 35 this purpose the heads 39 have secured thereto vibrators 46 which may be of any suitable construction, a for example electrical vibrators, or those of the pneumatic type such as used in foundry work, a suitable length of flexible lead or air hose (not shown, but depending upon the type of vibrator employed) being provided for connecting the vibrator to a source of electrical energy or compressed air supply.

As herein illustrated, for reciprocating the saw frame on the guide bars 19 the casting 33 at the left hand end of the machine, as viewed in Figs. 1 and 3, has secured thereto a pair of racks 47, while below each of these racks are provided stationary racks 49 carried on a frame 51 supported on the two transverse members 25 at the left hand end of the machine. Between the opposed stationary and movable racks and meshing therewith are positioned gear wheels 53 rotatably supported on a pin 55 carried at one end of a connecting rod 57, the other end of which rod is connected to the crank pin 59 of a crank 61. The shaft 63 which carries the crank 61 is mounted in bearings 65 carried on the frame 51. For rotating the crank shaft the latter is shown as provided with a gear wheel 67 in mesh with a pinion 69 rotated by a motor 71, the latter also being carried on the frame 51.

It will be observed by the above described construction that when the crank shaft 63 is rotated by the motor 71 the gears 53 will be reciprocated, which gears, due to their rolling action on the stationary racks 49, will move the movable racks 47 through a distance corresponding to twice the stroke of said gears. This mechanism affords a convenient means of reciprocating the saw with use of a relatively short crank arm 61.

As illustrated, for feeding the saw downward so as to advance the saw cut, a-vertical, rotatable shaft 73 is provided, to which shaft is splined a ratchet wheel 75, the shaft being connected by cooperatin spiral spur gears 76 to one of the lay sha ts 17 for operating the screws 7. Cooperating with the ratchet wheel is a pawl 77' of common construction mounted on an oscillatory arm 79, the latter being fulcrumed on the shaft 73. As shown the ratchet wheel rests on a bracket 80 secured to the adjacent guide bar 19, while one end of the arm 79 rests on the ratchet wheel and the other end of the arm on the guide bar, this construction causing the ratchet wheel and arm to be raised and lowered with the guide bar. On the reciprocatory saw frame is provided a pin 81 adapted at the end of the stroke of said frame in one direction to strike the head 83 carried at the end of the arm 79 so as to move said arm about its fulcrum and cause the pawl to turn the ratchet wheel, and consequently the shaft 73 and screws 7 through a part of a revolution. As shown the head 83 is mounted on the end of a rod 85 which extend through and slides in a perforation in the end of the oscillatory arm and may be held in adjusted position relative to said arm by a set-screw 87, which construction will permit the rate of downward feeding of the saw frame to be Varied. For raising the saw frame and for lowering it independently of the action of the ratchet operated mechanism just described, a motor 88 is provided. which motor is geared to one of the lay shafts 17.

Herein for cushioning the saw frame at each end of it travel is provided a cylinder 89 and a cooperating piston 91, the piston having a rod 93 connectedby a bracket 95 to that casting 33 of the saw frame which is adjacent the saw frame driving motor 71, the cylinder being pivoted at the end thereof opposite that through which the rod 93 extends to a pin 97 carried by a bracket 99 on the transverse member 101 of the frame 51. As illustrated, opposite ends of the cylinder are placed in communication by a pipe 103, said pipe having a valve 105 which may be more or less opened to restrict the flow of fluid, such as oil, while it fills the cylinder,

said pipe 103 conveniently communicating with the cylinder at such distances from the closed ends of the latter as will cause a cushioning effect on the piston 91 and hence on the saw frame at each end of the stroke of the saw.

As shown the stone S is mounted on a wheeledv carriage 107 mounted on tracks 108, said carriage bein provided with a drawbar 109 carrying t e head 111 which has a screw threaded perforation 113 through which extends a rotatable screw 115, the latter being operatively connected for rotation to an electric motor 117 through a high ratio reduction gearing the casing of which is shown at 119.

For coordinately movin the carriage 107 relative to the downward eeding of the saw, so as to give the saw cut S a predetermined profile in planes transverse to the length of the saw, a template 121 is herein provided, said template as illustrated being provided with rollers 123 cooperatin with a stationary track 125 so that the temp ate may be moved transversely to the saw by a bar 127 connecting the lower end of said template to the head 111.

As illustrated (see Figs. 2, 7, 8 and 9) the template, which may be of insulating material, as for example maple treated with parafiin, is provided with a slot 129 corresponding in shape to the profile of the saw cut S to be formed. As illustrated, opposite sides of the slot 129 have secured thereto metallic strips 131 between which is mounted a contact roller 133 carried on a stud 135 mounted on a bracket 137 carried by the angleiron 21 of'the vertically movable frame WhlCh supports the reciprocatory saw. As shown the stud 135 is insulated from the bracket 137 by a bushing 139 of suitable insulating material, and is placed in communication by a lead 141 with one terminal in the secondary winding 143 of a step down transformer, the primary winding 145 of which is connected across onephase of a line 147. As shown (Fig. 2) one terminal of the secondary winding 143 of the step down transformer is connected in parallel to one terminal of the energizing coils of each of two alternating current relays 149, the other terminals of these two relays being respectively connected by leads 151 and 153 to the opposite metallic strips 131 on the template. The contact roller 133 cooperating with the metallic strips 131 has an exterior dlameter slightly less than the distance between said stri s, and when the saw is fed downward said roller will strike one or the other of said strips to complete the circuit through one or the other of the relays 149, causing the armature 155 of the relay thus energized to operate the associated switch 156 to energize the motor 117 in one or the other of two phase-relations and thus cause said motor to rotate in one or the other of opposite directions, which rotation will move the carriage 107 and template either to the right or left, as viewed in Fig. 2, until the contact roller moves out of contact with the terminal strip to cause the circuit through the motor to be broken.

Herein for causing the portion of the saw at the bottom of the saw cut to remain substantially tangent to the profile of the saw cut the rotatable spindles 37 on which the saw is mounted are each provided with bevel gears 157, each gear meshing with a cooperating bevel gear 159 on a lay shaft 161 rotatably carried on the adjacent casting 33 of the saw frame. That end of each lay shaft 161 which is opposite the end thereof carrying the gear 159 carries a spiral toothed spur gear 163 meshing with a cooperating spiral toothed spur gear 165, the two gears 165 respectively being carried by the opposite ends of a rotatable shaft 167 mounted on the saw frame. It will be observed that the construction described provides that rotation of the shaft 167 will cause rotation of the spindles 37 carrying the saw and hence will tilt the saw.

As shown (Figs. 1 and 6) the shaft 167 has splined thereto an arm 169, one end of which is mounted between the end of the bracket 137 and the end of an adjacent bracket 171, which brackets prevent reciprocation of the arm with the saw frame. and in which brackets the shaft is journalled. On the bracket 171 is fulcrumed at 172 a lever 173 connected at one end thereof to the end of the arm 169 by a link 175. The extension 177 of the arm 173 is shown as carrying a roller 179, preferably of insulating material, which roller fits in the groove 129 of the template so that as the saw is fed downward the roller by contact with one or the other of the sides of the groove will cause rocking of the shaft 167 and consequent tilting of the saw to keep the latter tangent to the profile of the saw cut.

Although I have described for purposes of illustration one particular embodiment of the invention it will be understood that within the scope of the invention wide deviations may be made from this embodiment without departing from the spirit of the invention.

Claims 1. A stone working machine having, in combination, a support, a carriage mounted riage toward the stone for advancing the saw cut, and means responsive to such feeding movement for coordinately efi'ecting tilting of said saw blade and feeding movement of said stone transversely to the first mentioned feeding movement to cause the saw cut to have a predetermined profile in planes transverse to the saw blade.

2. A sawing machine having, in combination, supporting means for a saw of the reciprocatory type, means for reciprocating said supporting means for causing said saw to cut; means for effecting feeding movement said saw in said planes to lie substantially tangent to the profile of said saw-cut.

3. A sawing machine having, in combination, supporting means for a saw of the recip' rocatory type, means for reciprocating said supporting means for causing said saw to cut, means for forming a saw cut of predetermined profile in planes transverse to said saw while maintaining the portions of said saw in said planes substantially tangent to said pro file; said last named means comprising mech anism for coordinately feeding said saw toward the work, means for effecting feeding of the work transverse to the saw, and means for tilting said saw transversely to its length.

4. A sawing machine having, in combination, supporting means for a saw of the reciprocatory type, means for reciprocating said supporting means for causing said saw to cut, means for forming a saw cut of predetermined profile in planes transverse to said saw while maintaining the portions of said saw in said planes substantially tangent to said profile; said last named means comprising mechanism for coordinately feeding said saw toward the work, moving the work transversely to the saw, and tilting said saw transversely to its length.

5. A sawing machine having, in combination, a carriage for supporting the work, a supporting frame for a saw of the reciprocatory type, said carriage being movable transversely to the length of said saw, and means for reciprocating said frame, means for feeding said frame toward said carriage, and means for coordinately effecting transverse movement of said carriage relative to said frame to form a saw-cut of predetermined profile in planes transverse to the sawcut.

6. A sawing machine having, in combination, a carriage for supporting the work, a supporting frame for asaw of the reciprocatory type, said carriage being'movable transversely to the length of said saw, means for reciprocating said frame, means for feeding said frame toward said carriage, means for coordinately effecting transverse movement of said carriage relative to said frame to form a saw-cut of predetermined profile in planes transverse to the saw-cut, said saw being mounted on said frame for tilting movement transversely to its length, and means for maintaining the portions of said saw in said planes substantially tangent to said profile.

7. A sawing machine having, in combination. a. carriage for supporting the work, a supporting frame for a saw of the reciprocatory type, said carriage being movable transversely to the length of the saw, and n1 ans for reciprocating said frame and feeding it toward said carriage while coordinately moving said carriage relative to said frame to form a saw-cut of predetermined profile in planes transverse to the saw-cut.

8. A sawing machine having, in combination, a carriage for supporting the work, a supporting frame for a saw of the reciprocatory type, said carriage being movable transversely to the length of the saw, means for reciprocating said frame and feeding it toward said carriage while coordinately moving said carriage relative to said frame to form a saw-cut of predetermined profile in planes transverse to the saw-cut, said saw being mounted on said frame for tilting movement transversely to its length, and means for maintaining the portions of said saw in said planes substantially tangent to said profile.

9. A sawing machine having, in combination, means for operating a saw of the type whereof the saw-cut is formed by a straight length of saw, a work supporting carriage movable transversely relative to the cutting length of the saw, means for effecting feeding movement ofsaid saw relative to said carriage for advancing the saw-cut into the work, means for coordinately moving said carriage to form a saw-cut of predetermined profile in planes transverse to the saw-cut, and

I means comprising a template for tilting said saw to maintain the portions thereof in the saw-cut substantially tangent to said profile.

In testimony whereof, I have signed my name to this specification.

PETER S. LEGGE. 

